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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e24541e7d3abd6bc72c2ab2f3607ca2ec8337ace9ba95ab15b3a1bf1e49a4e' 
  AND token = 'MgAcvs60vGw4BUkKXtUNZPr2XP/msuoFqBBOLle60R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}